Re: [ULC-developer] Nullpointer in JFreechart Extension

Thu, 12 Mar 2009 04:40:18 -0700 


Hi,
Replace UIChartEntity with this code (there is a difference in handling coordinates in newer jfreechart libraries) 

public class UIChartEntity extends UIProxy {

private Shape fArea;

private String fToolTipText;

private String CONST_RECT = "rect" ;
private String CONST_POLY = "poly" ;

public UIChartEntity() {
super();
}

public Shape getArea() {
return fArea;
}

public String getToolTipText() {
return fToolTipText;
}

public void setChartEntity(HashMap map) {
fToolTipText = (String) map.get("toolTipText");
setArea(map);
}

private void setArea(Map map) {
int[] xCoords = (int[]) map.get("xCoords");
int[] yCoords = (int[]) map.get("yCoords");

String entityShape = map.get("shapeType").toString();

if (entityShape.equals(CONST_RECT)) {
int width = xCoords[1] - xCoords[0];
int height = yCoords[1] - yCoords[0];
fArea = new Rectangle2D.Double(xCoords[0], yCoords[0], width,
height);
} else if (entityShape.equals(CONST_POLY)) {
int nPoints = xCoords.length;
fArea = new Polygon(xCoords, yCoords, nPoints);
}
}
}

Hope it helps.

Thanks,
Eugene

Kevin Hirschmann wrote:

Hi Eugene!

Thanks for your help!
Unfortunately, this solves only part of the problem:
Of course, there is no nullpointer exception now.
But still I don't get the event.
The root cause seems to be that the chart entities (which are there) are not
retrieved.

I really need to get these events. Exist there any update version? I am
really
Wondering because the example on the community page works.
I'm using: jcommon-1.0.12.jar, jfreechart-1.0.9.jar, jfreechart-extension-client-1.0.jar, jfreechart-extension-server-1.0.jar 

Thanks and kind regards,
Kevin Hirschmann


-----Ursprüngliche Nachricht-----
Von: Kevin Hirschmann [mailto:[email protected]] Gesendet: Donnerstag, 12. März 2009 09:22 
An: Bernhard Schüler
Betreff: WG: [ULC-developer] Nullpointer in JFreechart Extension


Hi Kevin ,

Replace the following in UIJFreeChart

private UIChartEntity findEntity(int x, int y) {
UIChartEntity result = null;

for (Iterator iter = fChartEntities.iterator(); iter.hasNext();) {
UIChartEntity entity = (UIChartEntity) iter.next();
if (entity.getArea()!=null){
if (entity.getArea().contains(x, y)) {
result = entity;
}
}
}
return result;
}

Regards,
Eugene

Kevin Hirschmann wrote:

Hi!
I encountered a problem using JFreeChart Extension II along with JFreeChart 1.0.9 (and the same for JFreeChart 1.0.0).
More precisely: jcommon-1.0.12.jar, jfreechart-1.0.9.jar, jfreechart-extension-client-1.0.jar, jfreechart-extension-server-1.0.jar
There is a nullpointer exception when a mouse event occurs and an IChartEventListener has been registered.
This appears to be the same problem which has previously been posted on [ULC-developer] 

(by Eugene Coelho, Wed, 19 Jul 2006 01:20:54 -0700).

Unfortunately, no answer has been posted.

To produce this error I added an ULCJFreeChart to the template created by
“New ULC Project Wizard –> Simple dialog ULC application template” in Eclipse. 

Please see below for the code and the stack trace.

Thanks and kind regards,

Kevin Hirschmann

Exception in thread "AWT-EventQueue-1" java.lang.NullPointerException
at 
com.canoo.ulc.community.jfreechart.client.UIJFreeChart$MouseEventHandler.fin
dEntity(UIJFreeChart.java:184)
at 
com.canoo.ulc.community.jfreechart.client.UIJFreeChart$MouseEventHandler.mou
seClicked(UIJFreeChart.java:162)

at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:212)

at java.awt.Component.processMouseEvent(Component.java:5520)

at javax.swing.JComponent.processMouseEvent(JComponent.java:3135)
at 
com.ulcjava.base.client.UILabel$BasicLabel.processMouseEvent(UILabel.java:38
)

at java.awt.Component.processEvent(Component.java:5282)

at java.awt.Container.processEvent(Container.java:1966)

at java.awt.Component.dispatchEventImpl(Component.java:3984)

at java.awt.Container.dispatchEventImpl(Container.java:2024)

at java.awt.Component.dispatchEvent(Component.java:3819)

at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)

at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3901)

at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)

at java.awt.Container.dispatchEventImpl(Container.java:2010)

at java.awt.Window.dispatchEventImpl(Window.java:1791)

at java.awt.Component.dispatchEvent(Component.java:3819)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
at 
com.ulcjava.base.client.FilteringEventQueue.dispatchEvent(FilteringEventQueu
e.java:61)
at 
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.ja
va:242)
at 
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java
:163)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)

public class TestChartEventsBoxPane extends ULCBoxPane {
// The structure of the class enables its visualization with ULC Visual Editor Plugin 

private ULCButton ulcButton = null;

private ULCLabel ulcLabel = null;

private ULCJFreeChart chartComponent = null;

public TestChartEventsBoxPane() {

initialize();

}

private void initialize() {

setHorizontalGap(5);
set(0, 1, 1, 1, com.ulcjava.base.shared.IDefaults.BOX_CENTER_CENTER, getUlcButton());
set(0, 0, 1, 1, com.ulcjava.base.shared.IDefaults.BOX_CENTER_CENTER, getUlcLabel());
set(2, 2, 1, 1, com.ulcjava.base.shared.IDefaults.BOX_CENTER_CENTER, getULCJFreeChart()); 

}

private ULCButton getUlcButton() {

if (ulcButton == null) {

ulcButton = new ULCButton();

ulcButton.setText("Say Hello");

ulcButton.addActionListener(new IActionListener() {

public void actionPerformed(ActionEvent e) {

new ULCAlert("Title","Hello!","OK").show();

}

});

}

return ulcButton;

}

private ULCLabel getUlcLabel() {

if (ulcLabel == null) {

ulcLabel = new ULCLabel();

ulcLabel.setText("Click button for greeting");

}

return ulcLabel;

}

private ULCJFreeChart getULCJFreeChart() {

if (this.chartComponent == null) {

this.chartComponent = new ULCJFreeChart();
double[][] data = new double[][] { { 4257, 4058, 3357 }, { 257, 58, 357 } }; 

CategoryDataset dataset = DatasetUtilities.createCategoryDataset(

new String[] { "prognose", "real" },

new String[] { "02.09.2008", "03.09.2008", "04.09.2008" },

data);
JFreeChart chart1 = ChartFactory.createBarChart("TEST", "", "", dataset, PlotOrientation.VERTICAL, false, 

false, false);

this.chartComponent.setChart(chart1, new Dimension(600, 400));
this.chartComponent.addChartComponentListener(new IChartComponentListener() { 

public void chartResized(UlcChartComponentEvent event) {
System.out.println("chartResized: latest chart size: " + event.getChartComponentSize()); 

}

});

this.chartComponent.addChartEventListener(new IChartEventListener() {

public void chartClicked(UlcChartEvent event) {

System.out.println("chart clicked");

}

public void chartEntityClicked(UlcChartEvent event) {

ChartEntity entity = event.getChartEntity();

System.out.println("entity coordinates: " + entity.getShapeCoords());

}

public void chartZoomed(UlcChartEvent arg0) {

;

}

});

}

return chartComponent;

}

}

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